How to build a lean-to glasshouse
Step 12. Complete and position the roof frame
Fix the two roof windows to the roof frame with hinges, as shown in the drawing below.
Then sit the roof frame on top of the wall frames. It should sit neatly in place held there by the fascia board.
Secure it with metal plates or galvanized strap intermittently placed along the sides and front. Also screw the fascia board to the left-side high wall. Screw in places that can easily be accessed later, should you ever want to dismantle the glasshouse.